All natural. No artificial ingredients. Chicken raised without antibiotics. Minimally processed. With chicken chorizo sausage and red onions. All-natural chicken chorizo sausage, sweet caramelized onions, roasted green peppers, a blend of four cheeses and Frontera's incredible fire-roasted tomato sauce. -Chef Rick Bayless. I lived above a pizza joint once - in Oaxaca, Mexico. Every evening, the aroma of yeasty golden crusts mingled with tomato and chiles and cilantro. It was pizza for sure, but pizza with a delicious Mexican spirit. Back in the States, my homemade pizza sauce started tasting a little like salsa. Toppings explored New World territories. The crust had the satisfying crispness of a traditional stone-fired oven. And a new pizza was born - Frontera Pizza.